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          EC20 mini PCIe-C接口
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        <p>​    这几天在调试移远的EC20 4G模块，选的这款型号是：EC20 R2.1 Mini PCIe-C模块接口的，如下图所示：</p>
<img src="https://xdl-blog-picture.oss-cn-shanghai.aliyuncs.com/img/微信图片_20210503154817.jpg" style="zoom:37%;">

<p>在手册《Quectel_EC20_R2.1_Mini_PCIe-C(Audio版本)_硬件设计手册_V1.0》中有介绍PCIe-C 模块接口引脚分配，其中贴有 EC20 R2.1 模块和天线连接器为TOP 面，反面为 BOT 面。</p>
<img src="https://xdl-blog-picture.oss-cn-shanghai.aliyuncs.com/img/微信截图_20210503155153.png" style="zoom:70%;">

<p>​    其中我用红色框出来的几个引脚，是(U)SIM接口，它是和sim卡有关系的。EC20 R2.1 Mini PCIe-C 模块的(U)SIM 接口符合 ETSI 和 IMT-2000 规范，支持 1.8V 和 3.0V 工作电压。引脚定义如下表所示：</p>
<img src="https://xdl-blog-picture.oss-cn-shanghai.aliyuncs.com/img/微信截图_20210503155719.png" style="zoom:57%;">

<p>​    通过 USIM_PRESENCE 引脚，EC20 R2.1 Mini PCIe-C 模块可支持(U)SIM 卡热插拔功能，并且支持</p>
<p>低电平和高电平检测。该功能默认关闭。详情请参考<strong>AT+QSIMDET</strong> 命令。</p>

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